Refrigerator thermometer



c. c. SPRL-:EN

REFRIGERATOR THERMOMETER Fild Dec. 11, 1.924

Dec. 22 A 1925 i 14 Chaffee C- .Speezz Pig; I

.90 Figure l Figure 1,

lkate'iited Dec.- 22,

" umren y iremos CHARLES C. SPREEN, OFDETBOIT, MICHIGAN, ASSIGNOR, lBY MESNE ASSIGNMENTS, i TO HINZIN'ATOBfGORIOEIfAilION', 0F liEvTlEtOIII, MICHIGAN, A CORPORATION OF citizen of the United States of America, and a resident of Det-roit,in the county of vYVayne 5, 5. and StateI vof Michigan, have invented certain new and useful Improvements' in Re' frigerator Thermometers,` of whichthe fol- .v lowing is a full, clear, and exact description. My invention relates to household refrigloeration and thevprincipal object (of my inventionv is to provide means for indicating the temperature existing within the refrigf erator. fIiithe drawin accompanying this| gs art thereof Il specification and forming'a have shown, for purposes of ustration, one form which my invention may assume. In these drawings:

Figure 1 is a front elevation of. this illus-V trative -embodiment of my invention,

2 isa section on the line 2-2 of Figure 3 is a section on the vline 3-3, of Fi 2, 'Whilev e f i e 4 isa perspective viewl of the shield for t e thermometer bulb., f

The device herein shown comprises afthermometer 11 disposed within the refrigerator Wall 12 preferably in the heat insulating material 13 lying betweenthe front wall late 14 andthe rear wall plate 15. The b lb 16 of the thermometer. 11 is. spacedfr om the heat insulating material 13 by means of a shield 17 inserted through an aperture 18 in `the inner wall plate 15 and provided at its `exposed end with a plurality of apertures 19 arranged to permit the airwithin the refrigerator to communicate freely with the Y thermometer bulb 16. 0n the other hand, the section of the thermometer stem 20 over which the tcp. of the thermometer fluid Nmoves in the range of temperatures occurring during norma/1 operation of the refrigerator is spaced from the heat insulating inal j terial 13 by a shield 21 inserted throu h and REFRIGERATOR THERMOMETER.

ii, i924. seria; ivo. 755,212.

l l' In order to provide1v for the expansion -of the thermometer fluid when the refrigerator is not in operation. and when the temperature within the refrigerator may reach upwards of one hundred de ees, theupper end ofthe stem 20 is provi ed with -a greatly I structiomand that I accomplish this result in a manner which maintains effective heat l insulation between the space within the refrigerator and the space exteriorly thereof and therefore inno appreciable manner decreases the eihciency of the refrigerator. In addition, it will be apparent to those skilled in the art that the particular embodiment of my invention herein shown contains advantages other than those herein pointed out or sug ested and also that the particular embodiment of my invention disclosed herein may be variously changed and modified without departing from the scope of my invention or sacrificing the advantages thereof. It will therefore be understood thatthe disclosure herein is illustrative only and that my invention is not limitedV thereto.

I claim: v

1. combination, a Arefrigerator wall\ havin an inner recess extending into said wall om the inner face thereof and an outer recess extending into'said wall from the outer face thereof and an aperture extending in` saidwall between said recesses,

and -a thermometer having its bulb disposed d v in said inner recess and its indicating portion vdisposed tending from said bulb to said indicatiii'g portion through said aperture.

2. Inv combination, a refrigerator w`all comprising an-inner wall, and an outer wall, and heat-msulating material therebetween, and-having an inner recess extending from the inner face of said refri rator wall -through'said inner wall into said heatinsufv in saidouter recess and coni 'nected to said bulb by a connecting stem exlating material', and an outer recess extenddicating portion disposed in'said' outer reing from the outer 4face of said refrigerator cess and connected to said bulb by a connect- Wall'through said outer Wall into said heating, stern extending from said bulb to said 10 insulating material, and an aperture e-xtendindicating portion through said aperture.

' 5 ing in said heatinsulating material betycveen In testimony whereof, I hereunto affix my 'Said recesses' and a thermometer having its signature. a n bulb disposed in said inner recess/and its in- CLES C. SPREEN. 

